For now the normalizer just does something stupid. Removing the whitespace.

parso/python/normalizer.py

@@ -14,7 +14,7 @@ class PEP8Normalizer(Normalizer):
     Normalizing to PEP8. Not really implemented, yet.
     """
     def normalize(self, leaf):
-        return leaf.prefix + leaf.value
+        return leaf.value
 
     def iter_errors(self, leaf):
         return iter([])

parso/tree.py

@@ -167,7 +167,7 @@ class NodeOrLeaf(object):
         try:
             children = self.children
         except AttributeError:
-            return normalizer(self)
+            return normalizer.normalize(self)
         else:
            return ''.join(child.normalize(normalizer) for child in children)